278828857838 has 16 divisors (see below), whose sum is σ = 426395249280. Its totient is φ = 136700325216.

The previous prime is 278828857831. The next prime is 278828857847. The reversal of 278828857838 is 838758828872.

It is a super-2 number, since 2×278828857838² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (278828857831) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 629918 + ... + 976961.

It is an arithmetic number, because the mean of its divisors is an integer number (26649703080).

Almost surely, 2^278828857838 is an apocalyptic number.

278828857838 is a deficient number, since it is larger than the sum of its proper divisors (147566391442).

278828857838 is a wasteful number, since it uses less digits than its factorization.

278828857838 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1608571.

The product of its digits is 770703360, while the sum is 74.

The spelling of 278828857838 in words is "two hundred seventy-eight billion, eight hundred twenty-eight million, eight hundred fifty-seven thousand, eight hundred thirty-eight".